#include <stdio.h>
char* strcat( char*p,const char*p1)
{
    char* q =p;

    while(*p!='\0') 
    {
        p++;
    }
     while(*p1!='\0') 
    {
        *p=*p1;
        p++;
        p1++;
    }
        p++;
      *p='\0';
       return q;

}



int main(int argc , const char *argv[])
{   
     char ch1[20]="wuhu,";
    char ch2[20]="qifei";
    printf("%s\n",strcat(ch1,ch2));


       return 0;
}